Unpartitioning HD without Boot Camp?? Please Help..!

I successfully installed boot camp and Windows XP Pro back in June. I have had no problems using it on my MacBook. I have come to a point where I have decided that I can live without Windows on my laptop. So with a total laps in judgement I reinstalled my Mac OSX on my MacBook. When I did this it erased the BootCamp that I used to install the partition on my HD. So at this point I have a fresh install of MAC OSX and I still have Windows on my laptop.

Does anyone know how to go in and remove the partition and restore the HD back to an all MAC format?

I tried that and each time you download BootCamp and run it, the program wants you to chose where to install it. When I do this I install it on the Mac side. Should I be installing it on the Windows side? Because when you do it on the Mac side it doesn't work.